build(deps): bump mysql-connector-java from 8.0.20 to 8.0.21

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.20 to 8.0.21.
- [Release notes](https://github.com/mysql/mysql-connector-j/releases)
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](mysql/mysql-connector-j@8.0.20...8.0.21)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

modules/jooby-bom/pom.xml

@@ -94,7 +94,7 @@
   <maven-tiles-plugin.version>2.17</maven-tiles-plugin.version>
   <mockito.version>3.4.4</mockito.version>
   <mojo-executor.version>2.3.1</mojo-executor.version>
-  <mysql-connector-java.version>8.0.20</mysql-connector-java.version>
+  <mysql-connector-java.version>8.0.21</mysql-connector-java.version>
   <netty.version>4.1.51.Final</netty.version>
   <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
   <node.version>v12.16.3</node.version>

pom.xml

@@ -29,7 +29,7 @@
 
     <!-- data -->
     <HikariCP.version>3.4.5</HikariCP.version>
-    <mysql-connector-java.version>8.0.20</mysql-connector-java.version>
+    <mysql-connector-java.version>8.0.21</mysql-connector-java.version>
     <log4jdbc.version>1.2</log4jdbc.version>
     <h2.version>1.4.200</h2.version>
     <hibernate.version>5.4.17.Final</hibernate.version>